Phil's biggest mistake was trading Chandler. The Knicks somehow pried him away from the then champion Mavericks who didn't want to pay him, as I recall. He helped the Knicks a lot defensively in the middle. I don't know where Tyson is now--if he can still run--but he would fit in the middle on the Celtics if he has anything left. A big guy who can rebound and defend next to Horford.